Research & Data

Use this portal to filter and search for all of our scientific information.

Ecology provides the high-quality science that is the foundation of Washington state environmental policy. Our monitoring, assessment, and modeling services provide a data-rich understanding of our state’s land, air, and water. We provide access to that data through reports, databases, maps and user-friendly online tools.

See more about this collection...

Adopted rule language (WAC 173-03) 11/15/17

This is adopted rule language for WAC 173-03 Public Records.

https://ecology.wa.gov/adopted-rule-language-wac-173-03-11-15-17

Adopted rule language (WAC 173-166) 04/11/18

This is adopted rule language for WAC 173-166 Emergency Drought Relief

https://ecology.wa.gov/adopted-rule-language-wac-173-166-04-11-18

Adopted Rule - Crosswalk with Repealed Rule and Federal Rule (WAC 173-360; WAC 173-360A) 07/17/18

This document provides a crosswalk between the provisions in the new Underground Storage Tank Rule and the provisions in both the repealed rule and the federal rule.

https://ecology.wa.gov/adopted-rule-crosswalk-with-repealed-rule-and-fede

Adopted rule language (WAC 173-167) -7/28/2021

This is adopted rule language for WAC 173-167 Emergency Drought Funding

https://ecology.wa.gov/adopted-rule-language-wac-173-167-07-28-2021

Adopted emergency rule language (WAC 173-446) 6-8-23

This is the first emergency adopted rule language for WAC 173-446, Climate Commitment Act Program Rule.

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-446-6-8-23

Adopted emergency rule language (WAC 173-443) 10/20/20

This is emergency adopted rule language for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-443-10-2

Adopted Rule - Overview of Changes to Repealed Rule (WAC 173-360; WAC 173-360A) 07/17/18

This document provides a summary of changes to the repealed chapter, WAC 173-360. Changes highlighted grey were made to be consistent with federal rule requirements in 40 C.F.R. Part 280 or to comply with state program approval (SPA) requirements in 40 C.F.R. Part 281.

https://ecology.wa.gov/adopted-rule-overview-of-changes-to-repealed-rule

Adopted emergency rule language (WAC 173-167) 06/04/2019

This is an emergency adopted rule language for WAC 173-167 Emergency Drought Funding

https://ecology.wa.gov/adopted-rule-language-wac-173-167-06-04-19-1

Adopted emergency rule language (WAC 173-443) 07/30/19

This is an emergency adopted rule language for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-443-07-3

Adopted Rule - Summary - Certification for UST Services (WAC 173-360; WAC 173-360A) 07/17/18

This table identifies the underground storage tank system services requiring use of a service provider and the certification that a service provider must have to perform those services under the new rule, Chapter 173-360A WAC.

https://ecology.wa.gov/adopted-rule-summary-table-certification-to-perfor

Adopted Rule - Summary - O&M Compliance Dates (WAC 173-360; WAC 173-360A) 07/17/18

This table summarizes the dates by which owners and operators of underground storage tanks systems installed on or before the effective date of the new rule, Chapter 173-360A WAC, need to comply with the new operation and maintenance requirements.

https://ecology.wa.gov/adopted-rule-summary-table-operation-and-maintenan

Adopted Rule - Summary - Deferred UST Compliance Dates (WAC 173-360; WAC 173-360A) 07/17/18

This table summarizes the dates by which owners and operators of previously deferred underground storage tank systems installed on or before the effective date of the new rule, Chapter 173-360A WAC, need to comply with the requirements of the rule.

https://ecology.wa.gov/adopted-rule-summary-table-previously-deferred-ust

Adopted Rule - Summary - Record Retention Periods (WAC 173-360; WAC 173-360A) 07/17/18

This table summarizes how long owners and operators of underground storage tank systems need to retain records of various regulated activities under the new rule, Chapter 173-360A WAC.

https://ecology.wa.gov/adopted-rule-summary-table-record-retention-period

Adopted Rule - Text with Identified Changes to Repealed Rule (WAC 173-360; WAC 173-360A) 07/17/18

This document identifies the differences between the new rule (Chapter 173-360A) and the repealed rule (Chapter 173-360). The changes are identified in the footnotes. This document also provides a crosswalk between the provisions in the new rule and the provisions in both the repealed rule and the federal rule.

https://ecology.wa.gov/adopted-rule-text-with-identified-changes-to-repea

Adopted Rule - Text with Tracked Changes to Proposed Rule (WAC 173-360; WAC 173-360A) 07/17/18

There are some differences between the proposed Underground Storage Tank rule filed on January 24, 2018, and the adopted rule filed on July 18, 2018. This document identifies all of the changes Ecology made to the text of the proposed rule, including all deletions and additions.

https://ecology.wa.gov/adopted-rule-text-with-tracked-changes-to-proposed

Administrative Order for Tank AY-102 - March 21, 2014

The Washington State Department of Ecology issues an Administrative Order against the U.S. Department of Energy and Washington River Protection Solutions.

https://ecology.wa.gov/administrative-order

Appendix A: Response to Comments for Permit Effective August 1, 2013 (August 1, 2012) Part IV Addendum

Addendum to Part IV - Response to Comments on the Phase I Annual Report Questions for Cities and Counties

https://ecology.wa.gov/addendumtophaseivrtc

Adopted emergency rule language (WAC 173-446) 9-7-23

This is the second emergency adopted rule language for WAC 173-446, Climate Commitment Act Program Rule.

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-446-9-7-23

Adopted emergency rule language (WAC 173-446) 1-4-24

This is the third emergency adopted rule language for WAC 173-446, Climate Commitment Act Program Rule.

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-446-1-4-24

Adopted emergency rule language (WAC 173-167) 08/14/24

This is an emergency adopted rule language for WAC 173-167